Oil life?? Time vs. mileage ....

My Neon's oil is at least a year old. I think it's had 6 oil changes over 13 years and 200K+ miles. My truck's is 2-3 years old but if it's got 1000 miles on it I'd be surprised.

I think oil takes a long time to get "sour". If it's just sitting it's getting condensation in the engine but not mixing with the oil. It will get mixed when you fire it cold, and it will boil out of it when it reaches operating temp. This happens in minute levels every day. Leave it sitting outside for a year or two and you'll have some water in the bottom of the pan. It took 10 years but I have enough water in a 400 to push the oil out the dip stick tube hole of the block.